You have time and want to go deep. Start with the harder, more rigorous free courses.
CS50's Introduction to AI with Python runs 7 weeks with 12 projects, costs nothing and gives a free CS50 Certificate if you score 70% on every project.
The Machine Learning Specialization has 3 courses and 95 hours of Andrew Ng's lessons. Coursera's FAQ says you cannot take it for free, so check the cost first.
Practical Deep Learning for Coders has 9 lessons of about 90 minutes, costs nothing and has no certificate. You deploy your own model by the end of lesson 2.
Too shallow for someone with time to go deeper.
Train, evaluate and explain classic ML models
Usually not yet. Build a portfolio of projects first; a certificate matters less than proof of work.
Learning paths line up the right courses in order, with a project after each one.
